There will be well-testable theories, hardly testable theories, and non-testable theories. Those which are non-testable are of no … - Karl Popper

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Suffering is a byproduct of evolution by natural selection, an inevitable consequence that may worry us in our more sympathetic moments but cannot be expected to worry a tiger - even if a tiger can be said to worry about anything at all - and certainly cannot be expected to worry its genes.

Karl Popper

There will be well-testable theories, hardly testable theories, and non-testable theories. Those which are non-testable are of no interest to empirical scientists. They may be described as metaphysical.

Described, May, Metaphysical, Scientist, Testable, Theories

Same Author Quotes

Appealing to his [Einstein's] way of expressing himself in theological terms, I said: If God had wanted to put everything into the universe from the beginning, He would have created a universe without change, without organisms and evolution, and without man and man's experience of change. But he seems to have thought that a live universe with events unexpected even by Himself would be more interesting than a dead one.

Beginning, Events, Interesting, Men, Terms, Way

There is no history, only histories.

Histories, History

We have become makers of our fate when we have ceased to pose as its prophets.

Become, Fate, Makers, Prophet

Simple statements are to be prized more highly than less simple ones because they tell us more; because their empirical content is greater; and because they are better testable.

Empirical, Greater, Highly, Ones, Simple, Statements

Science is perhaps the only human activity in which errors are systematically criticized and, in time, corrected.

Corrected, Criticized, Errors, Humans, Science